In situ architecture, function, and evolution of a contractile injection system.

In situ architecture, function, and evolution of a contractile injection system.
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收缩注入系统的原位结构,功能和演变。

DOI:
10.1126/science.aan7904
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发表时间:
2017-08-18
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Pilhofer M
Pilhofer M
中科院分区:
其他
文献类型:
--
作者:
Böck D;Medeiros JM;Tsao HF;Penz T;Weiss GL;Aistleitner K;Horn M;Pilhofer M

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收缩注射系统通过噬菌体尾状结构介导细菌细胞-细胞相互作用。与细胞外系统相反,6型分泌系统(T6 SS)由细胞内定位和附着于细胞质膜定义。在这里,我们使用冷冻聚焦离子束铣削,电子冷冻断层扫描,和功能测定,以研究T6 SS在亚洲阿米巴。原位结构显示了三个模块,包括可收缩鞘管、基板和锚。所有模块在发射后显示构象变化。横向基板相互作用协调T6 SS在六边形阵列。该系统介导与宿主膜的相互作用,并可能参与吞噬体逃逸。进化序列分析预测T6 SS比之前想象的更广泛。我们的见解构成了理解T6 SS关键概念和探索T6 SS多样性的基础。
Contractile injection systems mediate bacterial cell-cell interactions by a bacteriophage tail-like structure. In contrast to extracellular systems, the type 6 secretion system (T6SS) is defined by intracellular localization and attachment to the cytoplasmic membrane. Here we used cryo-focused ion beam milling, electron cryotomography, and functional assays to study a T6SS in Amoebophilus asiaticus. The in situ architecture revealed three modules including a contractile sheath-tube, a baseplate, and an anchor. All modules showed conformational changes upon firing. Lateral baseplate interactions coordinated T6SSs in hexagonal arrays. The system mediated interactions with host membranes and may participate in phagosome escape. Evolutionary sequence analyses predicted that T6SSs are more widespread than previously thought. Our insights form the basis for understanding T6SS key concepts and exploring T6SS diversity.
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